Shuttle-box tension-controlling mechanism for looms



Dec. 14 1926.

J. NORTHROP SHUTTLE BOX TENSION CONTROLLING MECHANISM FOR LOOMS 2 Sheets-Sheet 1 4ZTL7J 12207 5 1% Filed Nov Zl/iii Z656 wad/ 4 Dec. 14 1926. 1,610,701

J. NORTHROP SHUTTLE BOX TENSION CONTROLLING MECHANISM. FOR LOOMS Filed Nov. 16. 1923 2 Sheets-Sheet 2 MW Kaine Patented Dec. 14, 1926.

UNITED STATES PATENT OFFICE.

JONAS NORTHROP, OF HOPEDALE, MASSACHUSETTS, ASSIGNOR TO HOPEDALE MANU- FACTURING COMPANY, OF MILFORD, MASSACHUSETTS, A CORPORATION OF MASSA CHUSETTS.

SHUTTLE-BOX TENSION-CONTROLLING MECHANISM FOR LOOKS.

Application filed November 16, 1923. Serial No. 675,121.

The present invention relates to shuttle box tension controlling mechanisms for looms.

The object of the invention is to improve I and reorganize shuttle box tension controlling mechanisms for looms, with a view to obtaining variable pressure in receiving the shuttle depending upon the velocity of picking. and also to releasing the shuttle box tension at the proper time to facilitate the picking operation. To this end the invention consists of the shuttle box tension controlling mechanism hereinafter described and particularly defined in the claims- In the accompanyin drawings illustrating the preferred form 0 the invention, Fig. 1 is an elevation, partly in section, of a portion of a loom embodying'the features of the present invention, the lay being shown in approximately back" center position in full lines and in front center position in dotted lines; Fig. 2 is a detail of the binder releasing device; Fig. 3 is a plan View of the parts in front center posit-ion; and Figs. 4 and 5 are details to be referred to. v

The illustrated embodiment of the invention comprises a lay 6 having a shuttle box 8, a lay sword 10, a binder 12, all of which may be of any usual or preferred construction. The dagger shaft 14 has secured to it binder fingers 16 having adjustable binder premers 18 which engage with the binders. The dagger shaft carries also a dagger 20 which together with the frog 21 constitutes the protector mechanism of the loom. Secured to the dagger shaft is an arm 22 c nected to a rod 24 which slides through a collar 26 pivoted at-28 upon a bracket 30 which is adjustably secured to an upright part 31 of the loom frame by a bolt and slot connection 32 of the usual form. A compression spring 34 takes between thecollar 26 and a nut 36 on the bottom of the rod 24. This c onstitutes'the shuttle box tension controlling mechanism which varies the pressure on the binders in accordance-with the position of the lay at the time the shuttle is received within the box at the end of a pick. It will be seen that the compression of the spring is greatest at back center and decreases gradually as the lay beats forward. The earliest time at which ashuttle arrives in its box is at back center and at this time maximum resistanceis enwhich takes between the stop lug 42 and a stud 46 on the cam device. The bracket 40 is adjustably attached to the upright 31 by a bolt and slot connection 48. The cam device 38 lies in the path of a cam roll 50 mounted at the end of an arm 52 branchin from the arm 22 which is secured to the dagger shaft. As the lay beats up, that is to say, moves from its full line position to the dotted line position in Fig. 1, the cam roll 50 strikes against the cam 38 and turns the latter against the torsion. of the spring, thereby permitting the cam roll to pass forwardly of the cam. On the rearward beat of the lay the cam roll strikes the upper surface of the cam, as will be apparent from Fig. 1, and rotates the dagger shaft to remove the pressure from the binders at the proper time for picking. This release occurs just before top center is reached and continues to a point substantially beyond top center, after which the cam r0 1' is pulled downwardly by the action of the compression spring 34, there-- by placing the shuttle box tension controlling mechanism in operation to vary the binder pressure in accordance with the time of receiving the shuttle. It will be seen that the use of the cam device 38 mounted upon the adjustable bracket permits the adjustment of the time and degree of binder release with considerable nicet The co-pending application 0 Dra er for a protector or anti-bang mechanism which operates to slide the whip roll and release the whip roll tension when a shuttle is trapped in the shed, it has been found that the compression of the whip roll springs, against which the whip roll is moved, tends to pull the lay backward and give the crank a reverse rotation. If the reverse rotation continues through top center the binders will be released, just as on a normal movement through top center, thus permitting the dagger of the protector mechanism to rise clear of the frog. As the lay continues on its forward movement a smash is caused by the presence of the trapped shuttle so that the protector mechanism, although effective to prevent a smash on the normal beat of the lay, is powerless to prevent one on the retrograde movement. The Draper application above referred to prevents such a condition by means of an automatic device for bringing the lay and crank to a stop before top center is reached. Such a construction, together with the crank operate binder release, may be of considerable value and highly desirable in certain instances and for certain purposes.

The present invention accomplishes the purpose of preventing a smash upon a reverse motion of the crank, but in a different manner from the above mentioned Draper construction." According to the present invention the binder release depends entirely upon the directionand motion of the lay itself rather than upon the position of the lay crank. Upon any forward beat of the lay, whether under normal conditions or caused by a reverse motion of the crank, the cam device 38 by-passes the binder release actuating arm 52, thereby having no effect whatever upon the dagger, which may remain depressed, if need be, to engage the frog and prevent a smash. The only time at which a release of the binder can occur is during a rearward beat of the lay when the roller 50 rides up upon the cam device.

While it is preferred to employ the specific construction and arrangement of parts shown and described, it will be understood that this construction and arran ement is not essential except so far as speci ed in the claims and may be changed or modified without departing from the broader features of the invention.

The invention having been described, what is claimed is:

1. A loom having, in combination, a lay, shuttle boxes, binders for the shuttle boxes, and a binder release for releasing the binder pressure for the picking operation and constructed and arranged to permit'binder release when the lay is moving rearwardly and being inoperative to affect binder pressuredurmg forward beats of the lay.

2. A loom having, in combination, a lay,

shuttle boxes, binders for the shuttle boxes, and means for releasing the binder pressure when the lay is substantially at top center upon a rearward beat .of the lay and being inoperative to affect binder pressure during forward beats of the lay.

3. A loom having, in combination, a lay, shuttle boxes, binders for the shuttle boxes, and a device mounted on the loom frame for releasing the binder pressure during a portion of the backward beat of the lay and being inoperative to affect binder pressure during forward beats of the lay.

4. A loom having, in combination, a lay, shuttle boxes, binders for the shuttle boxes, a rotary cam device mounted on the loom frame, and means adapted to be actuated by the cam device on a rearward beat of the lay for releasing the binder pressure, said means being by-passed by the cam device on a forward beat without releasing the hinders.

5. A loom having, in combination, a lay, shuttle boxes, binders for the shuttle boxes, an arm connected with the binders, and means on the frame for engaging the arm to release the binder pressure during rearward beats of the lay and being inoperative to affect binder pressure during forward beats of the lay.

6. A loom having, in combination, a lay, shuttle boxes, binders for the shuttle boxes,

a sliding rod connected with the binders,-

means acting on the rod for varying the hinder pressure in accordance with the time at which a picked shuttle is received in the shuttle box and means for releasing the binder pressure during the picking operation.

7. A loom having, in combination, a lay, shuttle boxes, binders for the shuttle boxes, an arm connected with the binders, means on the frame for engaging the arm to release the binder pressure on a rearward beat of the lay and to permit the arm to pass freely on a forward beat, a sliding rod connected with the arm, and a compression spring acting on the rod to cause the binders to press with maximum pressure when the lay is at back center and with gradually decreasing ressure as the lay moves forwardly from ack center.

8. A loom having, in combination, a lay. shuttle boxes, binders for the shuttle boxes, a rod having connections with the binders, a compression spring acting on the rod to place a varying spring pressure on the binders which is greatest at back'center and gradually decreases as the lay moves forwardly from back center and means for releasing the binder pressure during the picking operation.

9. A loom having, in combination, a lay, shuttle boxes, binders for, the shuttle boxes, a dagger shaft, connections between the dagger shaft and the binders, an arm secured to the dagger shaft, a rod connected at one end to the arm, a collar in which the rod is free to slide mounted on the loom frame, and a com- 5 pression spring taking between the collar and the end of the rod remote from the arm for placing a pressure on the binders and constructed and arranged to place maximum pressure on the binders when the lay is at back center and a gradually decreasing pressure as the lay moves forwardly from back center.

JONAS NORTHROP. 

